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Soldering is the act or process of forming joints upon or between metallic surfaces by means of a fusible alloy or solder whose melting point is lower than that of the metal to be united. After carefully cleaning the joint, a flux is applied to the cleaded areas to prevent oxidation, and a sutable quantity of solder is fused on a joint by a pressure flame.

A powerful soldering station with process control that allows you to select the temp you want without changing the tip. It can have also tweezers with revolutionary parallel action between the tip ends and allows greater surface contact berween the tip and the component is always useful.

It takes some practice to make the perfect joint. The idea
is simple: to join parts together to form an electrical connection, using a
molten mixture of lead and tin (solder) with a soldering iron. A large range of
soldering irons is available - which one is suitable depend on the budget.

The simplest and cheapest types of soldering
station don't have any form of temperature regulation. Simply plug them in and
switch them on! Thermal regulation is "designed in" (by physics, not
electronics!): they may be described as "thermally balanced" so that
they have some degree of temperature "matching" but their output will
otherwise not be controlled.
Unregulated irons form an ideal general purpose iron for
most users, and they generally cope well with printed circuit board soldering
and general inter wiring. Most of these "miniature" types of iron
will be of little use when attempting to solder large joints because the
component being soldered will "sink" heat away from the tip of the
iron, cooling it down too much. This is where a higher wattage comes in useful.

A proper temperature-controlled iron will be quite a lot
more expensive, and will have some form of built-in thermostatic control, to
ensure that the temperature of the bit (the tip of the iron) is maintained at a
fixed level (within limits). This is desirable especially during more frequent
use, since it helps to ensure that the temperature does not
"overshoot" in between times, and also guarantees that the output
will be relatively stable.Some irons have a bimetallic strip thermostat built into the
handle which gives an audible "click" in use: other types use
all-electronic controllers, and some may be adjustable.

Yet more expensive still, soldering stations and consists of a complete bench-top control unit into which a special
low-voltage soldering iron is plugged. Some versions might have built-in
digital temperature readout, and will have a control knob to enable to vary the
setting. The temperature could be boosted for soldering larger joints, for example,
or for using higher melting-point solders (e.g. silver solder). These are designed for the most discerning users, or for
continuous production line/ professional use. The best stations have irons
which are well balanced, with comfort-grip handles which remain cool all day. A
thermocouple will be built into the tip or shaft, which monitors temperature.

More advanced and expensive soldering iron
stations use static-dissipative materials in their construction to ensure that
static does not build up on the iron itself. It is useful to have a small selection of manufacturer's
bits (soldering iron tips) available with different diameters or shapes, which
can be changed depending on the type of work in hand. Often, tips are
iron-coated to preserve their life, or they may be bright-plated instead.
Copper tips are seldom seen these days. Spare parts: it's nice to know that spare
parts may be available, so if the element blows, it is not necessary to replace
the entire iron. This is especially so with expensive irons.